The PLL calculation heuristics is rather complicated and and is often
difficult to understand to its original author.
Signed-off-by: NSakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>